Bell door-knob



Patented May 2, 1899.

B. F. FLOWERS. BELL DOOR KNOB.

(Application filed Nov. 30, 1898.)

{No Model.)

THE Norms Perms so. PHOYO-LITHQ, WASmNGTQN, a. c.

UNITE STATES PATENT OFFICE.

BENJAMIN F. FLOWERS, OF FORT ooLLfNs, COLORADO.

BELL DOOR-KNOB.

SPECIFICATION forming part of Letters Patent No. 624,436,dated May 2, '1899. I

Application filed November 30, 1898. Serial No. 697,820. (No model.)

7 To all whmn it may concern:

Be it known that I, BENJAMIN F. FLOWERS, a citizen of the United States of America, residing at Fort Collins, in the county of Larilner'and State of Colorado, have invented certain new and useful Improvements in Bell Door-Knobs; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being hadto the accompanying drawings, and to the figures of reference ma'rkedthereon, which form a part of this specification.

My invention relates to improvements in hell door-knobs, my object being to provide a device of this class which shall be simple in construction, economical in cost, reliable, durable, and efficient in use; and to these ends the invention consists of the features, arrangements, and combinations hereinafter described and claimed,-all of which will be fully understood by reference to the accompanying drawings, in which is illustrated an embodiment thereof.

In the'drawings, Figure 1 is a longitudinal section taken through'the device, a portion of the operating parts inclosed by the bell-knob,together with the spindle and pushrod, being shown in elevation. In this view the push-button and its rod are in the normal position. Fig. 2 is a similar View showing the push-rod actuated and the bell-hammer withdrawn ready to strike. Fig. 3 is a section taken on the line a; so, Fig. 2. Fig. 4 is adetail sectional View of the bell-knob, showing the parts in striking position. Fig. 5 is a section taken on the line y y, Fig. 4, looking toward the right. Fig. 6 is a front elevation of the exterior knob, showing the inscriptions. Fig. 7 is a detail view showing the interior face of the operating-ca m. Fig. 8 is an edge view of the same. Fig. 9 is a cross-section taken through the cam, the spindle and the push-rod on the line of the screwstud. 1

Similar reference characters indicate corresponding parts in the views.

is attached the outer knob 7, provided with an opening 8 and an iuteriorlyextending guidesleeve 9. This knob is secured to the spindle by a screw 14. Located on the opposite side of the door from the knob 7 is the base or bracket 10 of the bell-knob 12. This base is attached to the spindle bymeans of a screw 13. The spindle 5 is square exteriorly and formed hollow to receive the reciprocating rod 15. To one extremity is attached a push-button 16, adapted to move in the guide-sleeve 9. Surrounding the rod 15 and located between the base of the knob and the push-button is a coiled spring 17, which normally holds the button and its rod at the outer limit of movement. (Shown in Fig. 1.) A screw 18, inserted in the push-rod and protruding through a slot 5, formed in the spindle, may be utilized to connect the device with the circuit of an electric bell which may be operated by the rod. The bell-knob 12 is attached to the interior extremity of the spindle by means of a screw 19.

To the interior extremity of the push-rod Or the extremity remote from the button 16 is attached a cam 20 by means of ascrew-stud 21. This screw passes through a plain opening in the cam, while its inner threaded extremity enters a threaded opening in the pushrod. The cam turns freely on the unthread'ed or plain portion of the screw. Its turning movement, however, is limited by a diamondshaped tongue 20, which travels in a guide slot or way 22, formed in the spindle. The cam is permitted sufficient movement on the screw-stud to allow, the parallel faces of the tongue to engage the edges of the slotted way, which form a track therefor, as shown by dotted lines in Figs. 1, 2, and 4. On the outer rim of the bell-knob base 10 is fulcrumed at 23 a lever-arm 24, normally occupying a posihammer 24, located at its outer extremity.

The arms 24 and 24 straddle the cam 20, which works in the opening between them. This cam, as shown in the drawings, is approximately triangular in shape, and two of its sides are adapted to engage the lever-arm 24 and force the latter outwardly or away from the spindle as the reciprocating rod 15 is actuated, the hammer 24 being simultaneously drawn inwardly toward the spindle preparatory to striking the inner surface of the bellknob 12, which forms the gong. The leverarm 24.- is held against the spindle, as shown in Figs. 1, 4, and 5, and in contact with one of the sides of a cam by the coiled spring 25. To operate the hammer 24 or ring the bell, it is only necessary to press on the button 16, causing the rod 15 to move outwardly in the hollowspindle. During this action the cam is forced against the lever-arm 25, which travels outwardly to the point or apex of the cam. As soon as the lever-arm passes over the point of the cam this arm is released and the recoil of the spring 25 throws the hammer outwardly, causing it to strike the gong 12. The parts are then in the position shown in Fig.4. As soon as the button 16 is released from pressure the recoil of the spring 17 imparts the reverse movement to the rod 15 and the cam, which again forces the lever-arm Mupwardly until it rides over the point of the cam and is again released, the recoil of the spring 25 again causing. the'hammer to strike the gong or hellknob 12, thus returning the parts to the normal position, as shown in Fig. 1. Hence for each reciprocation of the push-rod the bellhammer strikes twice.

During the operation of the cam, as heretotofore described,the guide-tongue 20 engages the walls of the slot 22 in the spindle. As the push-rod is forced inwardly the parallel sides 20? of the tongue engage the opposite sides of the slotted way, while when the push-rod makes the reverse movement the parallel sides 20 of the tongue engage the sides of the said way. Thus it will be seen that this diamondshaped tongue permits a limited movement of thecam upon the screw-stud 21. This movement of the cam enables it to turn out of the way of the lever-arm during the latters inward movement, thus permitting the said arm .to move inwardly to the stem without obstruction after the arm has passed over the point or apex of the cam.

more or less resistance to the inward movement of the arm and to this extent interfere with the striking action of the hammer,whose Vere it not for this. movement of the cam the latter would offer point of the screw 14,wl1ereloy the position of the knob 7 may be regulated to correspond with the thickness of the door.

The longitudinal openingin the hollow stem is closed at its inner extremity to limit the inward movement of the push-rod,while the opposite end of the slot 22 limits the return movement of the rod.

Having thus described my invention,what I claim is- 1. The combintionwith the hollow spindle, the knobs and the spring-held reciprocating rod operating in the spindle, ofa cam mounted on the rod and located outside the spindle which is slotted to permit the required movement, a spring-held lever-arm suitably fulcrumed and located in the path of the cam as the said rod isactuated, and a hammer-arm carried by the said lever-arm.

2. The combination with the hollow spindle,- the knobs and a spring-held reciprocating rod working within the spindle, of a cam mounted on the rod and located outside the-spindle, which is slotted to permit the required movement, a spring-held lever-arm suitably fulcrumed and located in the path of the cam which is allowed a limited movement to per mit the quick action of the lever-arm, and a ham mer-arm carried by the lever-arm.

3. The combination with the hollow spindle, the knobs and the reciprocating rod working Within the spindle, of a-cam, a suitable fastening-screw connecting the cam with the rod and passing through a slotformed in the spindle, the cam being allowed to turn on its fastening device, the cam being provided with a diamond-shaped tongue, engaging the slotted way of the spindle and limitingthe movement of the cam, a lever-arm located in the path of the cam and a hammercarried by the outer knob having an opening and aninteri-' orly-projecting sleeve surrounding said opening, a push-button located in said opening and adapted to'enter said sleeve, a reciprocating rod adapted to operate the clapper, said rod being suitably connected with the pushbutton.

In testimony whereof I affix my signature in presence of two witnesses.

BENJAMIN F. FLONVERS. XVitnesses:

ISHAM R. HowzE, A. J. OBRIEN. 

